As you can see I have a listbox full of URLs. I would like to go through this list looking through the source code for each URL for the word "error" ... if the word is found, I would like to add "ERROR FOUND" to the end of the URL in the listbox. If not found, I would like to add "NOT FOUND" to the end of the URL in the listbox.

Here's the code I already have for getting the source code of the URL:

Code:
    Function DownloadChunks(ByVal sURL As String)

        Dim wRemote As System.Net.WebRequest
        Dim bBuffer(999) As Byte
        Dim sResponseData As String
        Dim iBytesRead As Integer

        wRemote = WebRequest.Create(sURL)


        Dim sChunks As Stream = wRemote.GetResponse.GetResponseStream
        Do
            iBytesRead = sChunks.Read(bBuffer, 0, 1000)

            sResponseData &= System.Text.Encoding.UTF8.GetString(bBuffer)
        Loop Until iBytesRead = 0


        sChunks.Close()

        Return sResponseData
    End Function

    Private Sub cmdStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdStart.Click
        Dim sData As String = DownloadChunks(URL-GOES-HERE)
        txtHTML.Text = sData
    End Sub
Where URL-GOES-HERE is where the the URL goes, obviously.

Any help on how I can do this with the listbox? Thanks!